package com.ltmonitor.web.controller;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Date;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
/**
 * 验证码输出
 * @author admin
 *
 */
@Controller
public class RandomPictureAction extends GenericAction {

	@RequestMapping("/randomPicture.action")
	public void execute(HttpServletRequest req, HttpServletResponse resp) throws Exception {

		try {
			Date d = new Date();

			int width = 60;
			int height = 20;
			BufferedImage image = new BufferedImage(width, height, 1);

			Graphics g = image.getGraphics();

			Random random = new Random();

			g.setColor(getRandColor(200, 250));
			g.fillRect(0, 0, width, height);

			g.setFont(new Font("Times New Roman", 0, 18));

			g.setColor(getRandColor(160, 200));
			for (int i = 0; i < 155; i++) {
				int x = random.nextInt(width);
				int y = random.nextInt(height);
				int xl = random.nextInt(12);
				int yl = random.nextInt(12);
				g.drawLine(x, y, x + xl, y + yl);
			}

			String sRand = "";
			for (int i = 0; i < 4; i++) {
				String rand = String.valueOf(random.nextInt(10));
				sRand = sRand + rand;

				g.setColor(new Color(20 + random.nextInt(110), 20 + random
						.nextInt(110), 20 + random.nextInt(110)));

				g.drawString(rand, 13 * i + 6, 16);
			}

			super.putSession("randomCode", sRand);

			g.dispose();
			/**
			ByteArrayOutputStream output = new ByteArrayOutputStream();
			ImageOutputStream imageOut = ImageIO
					.createImageOutputStream(output);
			ImageIO.write(image, "JPEG", imageOut);
			imageOut.close();
			ByteArrayInputStream input = new ByteArrayInputStream(
					output.toByteArray());
			output.close();
			*/
			ServletOutputStream sos = resp.getOutputStream();
	        ImageIO.write(image, "jpeg", sos);
	        sos.close();
		} catch (Exception ex) {
			log.error(ex.getMessage(), ex);
		}

	}

	public static int computeStringByteLen(String s) {
		int length = 0;
		for (int t = 0; t < s.length(); t++) {
			if (s.charAt(t) > 'ÿ') {
				length += 2;
			} else {
				length += 1;
			}
		}
		return length;
	}

	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

}
